Bug1275617. Existing code only accept a boolean value for the $error
parameter, and return 0 or 127 for success or failure. This patch
allows you to pass an int for the $error parameter, in which case
that int is used as the return code. If you pass a boolean, we use
the old 0/127 behavior.

Change-Id: I96637f9c896184dc36c51bb968284f47f4fbc864